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Superconductivity and spin-glass like behavior in system with Pd sheet sandwiched between graphene sheets | | Masatsugu Suzuki
; Itsuko S. Suzuki
; Jürgen Walter
; | | Date: |
14 Aug 2003 | | Journal: | J. Phys.: Condens. Matter 16 (2004) 903-918 DOI: 10.1088/0953-8984/16/6/018 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Pd-metal graphite (Pd-MG) has a layered structure, where each Pd sheet is sandwiched between adjacent graphene sheets. DC magnetization and AC magnetic susceptibility of Pd-MG have been measured using a SQUID magnetometer. Pd-MG undergoes a superconducting transition at $T_{c}$ ($= 3.63 pm 0.04$ K). The superconductivity occurs in Pd sheets. The relaxation of $M_{ZFC}$ (aging), which is common to spin glass systems, is also observed below $T_{c}$. The relaxation rate $S(t)$ shows a peak at a characteristic time $t_{cr}$, which is longer than a wait time $t_{w}$. The irreversibility between $chi_{ZFC}$ and $chi_{FC}$ occurs well above $T_{c}$. The susceptibility $chi_{FC}$ obeys a Curie-Weiss behavior with a negative Curie-Weiss temperature ($-13.1 leq Theta leq -5.4$ K). The growth of antiferromagnetic order is limited by the disordered nature of nanographites, forming spin glass-like behavior at low temperatures in graphene sheets. | | Source: | arXiv, cond-mat/0308292 | | Services: | Forum | Review | PDF | Favorites | |
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